Tooth-bar guide and arrester.



No. 739,046. PATENTED-SEPT. 15, 1903. T. S. WILKIN. TOOTH BAR GUIDE ANDARRESTER.

APPLICATION FILED APR. 13, 1903.

N0 MODEL.

UNITED STATES iatented September 1 5, 1903.

PATENT Orrics.

THEODORE S. WILKIN, OF MILWAUKEE, WISCONSIN.

TOOTH-BAR GUID E AND ARRESTER.

SPECIFICATION forming part of Letters Patent No. 739,046, datedSeptember 15, 1903.

Application filed April 13, 1903.

To all whom it may concern:

Be it known that I, THEODORE S. WILKIN,

residing at Milwaukee, in the county of Milnection with the tooth-bar ofa log-turner in a sawmill, to guide the movement of the tooth-bar, andto arrest the shock caused to a tooth-bar as heretofore mounted when inits throw laterally it contacted with the end or ends of the floor-platesecured rigidly to the floor of the mill.

My improved device is shown in the draw-- ings in connection with atooth-bar of the general form and character of that shown in Patent No.583,560, issued to me on June 1, 1897, though the use of the device willnot be confined to a tooth-bar of that specific construction and mode ofoperation.

The invention consists of the device; its parts and their combinations,as herein described and claimed, or the equivalents thereof.

In the drawings, Figure 1 shows a fragment of the upper portion of atooth-bar and a member of a floor-plate of a sawmill with my improveddevice mounted thereon in proper relation to the tooth-bar. 'Fig. 2 is atop plan view of the floor-plate and my improved devices in connectionwith the upper portion of the log-turner which is shown incross-secriage travels.

The tooth-bar 2 is the upper portion of an upwardly and downwardlymovable logturner, the bar being provided with teeth 3, adapted toengage the log and turn it as the tooth-bar is forced upwardly. In theform of log-turner shown in the'drawings the tooth- SerialNn. 152,298(No model.)

' bar is supported by a link or ancillary bar 4,

connected to the tooth-bar at its upper end pivotally. The tooth-bar andthe ancillary bar are connected in the usual way at their lower ends tomeans for raising and lowering them and at the same time and to such eX-tent as is desired within the limits of the movement permitted to swingthe tooth-bar forward and back. The teeth of the toothbarprojectforwardly therefrom in the manner shown in the drawings, and the usualconstruction of the tooth-bar is a bar made up of two side plates 5 5,between which the teeth 3 are interposed, the teeth being ordi narilypivoted to the plates.

A floor-plate consists of two bed-pieces 6 6,

supported on sills A A and placed complementary to each other onopposite sides and near to the path of the tooth-bar 2 and its link 4.The construction and dispositionof these bed-pieces forming thefloor-plate are such as topermit of the forward and back swing of thetooth-bar and its ancillary bar, while preventing the movement sidewiseof the bar. For strengthening the construction tie-strips 7 7 aresecured to the bed-pieces at the front and at the rear in such manner asto assist in holding the bed-pieces, especially near the top, inpermanent position with reference to each other.

at the front and at the rear of the tooth-bar swinging crank-arms 8 8 inpairs, one at each side, the pivot-pins 9 9 of which crank-arms havetheir bearings revolubly in the bedpieces 6 6 and are held in placetherein by bolts 10 10, the bolts being provided with washers orbearing-plates 11 11, that bear against the outer surfaces of thebed-pieces. This construction permits the arms to swing freely forwardand back. The arms 8 are provided with wrist-pins 12 12, and preferablyantifriction-rollers 13 13 are mounted thereon. These rollers fitagainst the edges of the side plates 5 5 of the tooth-bar, but do notextend inwardly far enough to contact with the teeth 3. The constructionis such that when the tooth-bar is forced upwardly and forwardly orrearwardly the wrist-pins 12 12, by their antifriction-rollers 13 13bearing against the edges of the side plates 5 5 of the tooth-bar, ridealong on the tooth-bar,

and at the same time the arms at that side of the bar toward which it isbeing swung swing upwardly, and as the arms approach horizontalpositions the strain of the tooth-bar thereon in its forward or backwardmovement becomes steadily less and less a cross strain and more and morea direct strain from the pivots of the arms, whereby the forward orbackward movement of the tooth-bar is more and more restrained until thearms come to a horizontal position, when the swing of the tooth-bar isabsolutely arrested, the swing of the tooth-bar to that point havingbeen increasingly restrained from the starting of the swinging of thearms more and more until it is finally absolutely arrested, but withoutshock, such as would occur if the tooth-bar were arrested in itsmovement by contact with a fixed stop without any previous limiting orarresting action.

What I claim as my invention is- 1. The combination with the tooth-barof a log-turner, of pivoted suspended laterallyswinging arms, at theirfree extremities engaging the tooth'bar and adapted to increasinglyarrest and ultimately to prevent the movement of the tooth-bar forwardorback.

2. In combination, a tooth-bar of a logturner mounted to be raised andlowered and concurrently to swing forward and back, a fixed floor-platethrough which the tooth-bar is movable and which plate is adapted toprevent displacement of the tooth-bar laterally, and pivotally suspendedand swinging arms at the sides of the tooth-bar, which arms at theirfree extremities engage the tooth-bar movably and are adapted toincreasingly arrest and ultimately to prevent the forward or back motionof the bar.

3. Inasawmill, means forcontrolling movements of a log-turningtooth-bar, comprising a floor-plate, and thereon pivotally-suspendedcranked arms adapted to engage movably the tooth-bar and increasinglyarrest and ultimately stop the forward or back movement of the bar.

4:. In a sawmill, a log-turning tooth-bar, and pivotally-suspendedcranked arms adapted to engage the tooth-bar movably and with yieldingswing to increasingly arrest and ultimately to stop the movement of thebar forward or back.

In testimony whereof I atlix my signature in presence of two witnesses.

THEODORE S. WILKIN.

\Vitnesses:

O. T. BENEDICT, ANNA F. SOHMIDTBAUER.

